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    <title>神奇的canvas</title>
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        body{
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        div a{
            font-size: 20px;
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            font-size: 21px;
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        .list div{
            margin-bottom:10px;
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    <div class="container" style="margin-top:30px;">
        <h1 class="text-center">神奇的Canvas</h1>

        <div class="list" style="margin-top:50px;margin-left:auto;margin-right:auto;width:300px;">
            <div><a href="./ball.html">1、抛 彩 球</a></div>
            <div><a href="./clock.html">2、时 钟</a></div>
            
        </div>
        

    </div>
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